Highlights
- •OrthoK lenses slow axial length growth in children with myopia.
- •There were no significant differences between four different brands/designs of lenses after two years of wear.
- •The spherical equivalent refraction and age at baseline are not the main influencing factors of OthorK in myopia control.
Abstract
Purpose
To compare axial length (AL) elongation in myopic children with four Orthokeratology
(OrthoK) lenses and spectacles.
Methods
The medical records of 266 patients (532 eyes) who were fitted with OrthoK lenses
or spectacles (control group) were reviewed. Data collection included baseline age,
gender, baseline objective sphere and cylinder, baseline flat and steep corneal meridian
power, corneal asphericity coefficient (Q value), AL at baseline and after 1-year,
and 2-years of OrthoK or spectacle wear analyzed using analysis of repeated measures
data ANOVA. Stepwise linear regressions between the changes in AL after 2 years relative
to baseline parameters were calculated for the OrthoK and control groups separately.
Results
The baseline subject parameters for each of the four OrthoK lenses were not statistically
different. Statistically significant differences between time points were found between
12- and 24- months (all P < 0.05). AL growth was slower in all OrthoK groups than in the control group (all
P < 0.05). AL grew 0.081±0.034 mm per year slightly less than average with Essence
compared to the Mouldway OrthoK group (P = 0.019). The coefficient of regression weakly expressed between the increases in
AL over 2-years study period and baseline spherical equivalent refraction was 0.065
in Essence, 0.079 in Euclid and 0.087 in Mouldway. The coefficient of regression was
also weakly between age and the increases AL over 2-years study period and baseline
age in all groups.
Conclusion
Different OrthoK lenses differ minimally in slowing axial elongation effectively in
myopic children during 2-years lens wear.
Keywords
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Article info
Publication history
Published online: December 04, 2019
Accepted:
November 26,
2019
Received in revised form:
November 15,
2019
Received:
July 9,
2019
Identification
Copyright
© 2019 British Contact Lens Association. Published by Elsevier Ltd. All rights reserved.
